BOSTON (CBS) — If the Boston Celtics want to make a second half push for the playoffs, they’ll likely have to do it without big man Jared Sullinger.

Sullinger is out indefinitely with a stress reaction in his left foot, the team announced Thursday.

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Sullinger, Boston’s leading scorer this season at 14.4 points per game, started experiencing discomfort in the foot the day after the team’s win over the Atlanta Hawks before the All-Star break. He took himself out of practice on Wednesday in Sacramento, and X-Rays on Thursday revealed the injury.

“Jared is going to be out a while,” Celtics coach Brad Stevens told reporters on Thursday. “Supposedly it happened in the Atlanta game and he was talking a little bit about it [Wednesday], with regard to feeling some discomfort and so he went through a little bit of practice, then pulled himself out. [Trainer] Ed [Lacerte] took him to get the X-ray, so that’s not good news on the Jared front, that’s for sure.

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“He’s not going to play on this trip, and I don’t anticipate him playing any time soon,” added Stevens.

“They didn’t tell me a lot, they just told me I’d be out a little bit,” Sullinger said. “It sucks, honestly. Especially with the type of [playoff] push we’re trying to make. For me to not be a part of it on the court — I’m trying to help the team from different angles.”

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Even with Sullinger, the Celtics’ depth in the front court was extremely thin. Now with Sullinger sidelined, and Kelly Olynyk still recovering from a sprained ankle, expect more of Tyler Zeller and Brandon Bass on the court together when Boston doesn’t utilize a small lineup.